The Orthodox church is the second largest denomination in the world, with over 3.5 million faithful. This weekend, they will celebrate Easter. Up to this point, they have been observing the Great Lent.

Why are they celebrating this month, when most Western Christians celebrated last month? Well, it has to do with the calendar. Western Christianity follows the Gregorian calendar, whereas the Orthodox religions (e.g., Russian, Greek, Coptic and Armenian) follow the Julian calendar, AKA the "Old Calendar".

Find out more about Orthodox Easter traditions in this informative clip with Father Christopher Stamas and Western Massachusetts News, Weather & Sports: